2018 Fiscal Year Research-status Report
Real-time THz wave near-field camera with metamaterial devices
| Project/Area Number |
17K18368
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| Research Institution | Institute of Physical and Chemical Research |
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Principal Investigator |
Han Zhengli 国立研究開発法人理化学研究所, 光量子工学研究センター, 基礎科学特別研究員 (20752702)
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| Project Period (FY) |
2017-04-01 – 2020-03-31
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| Keywords | film metamaterial / double-layer pattern / resonance modes |
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| Outline of Annual Research Achievements |
Metamaterial with double-layer split ring resonators (SRRs) with a film device was proposed for the terahertz (THz)-wave near-field imaging system. In this year, the development of film metamaterial device was optimized with photo-lithography technique, on the film thickness and film release conditions. Devices with film thickness of 40 micron and 15 micron were developed, both with double-layer SRRs. The film release procedure was checked with several temperature conditions and optimized to a range around to a range about 50 degC. Finally, uniform films with size of 30 mm by 30 mm were obtained. The developed devices were measured by THz TDS (THz time domain spectroscopy) for checking the spectra performance, which well matched with the simulation results. During the optimization on the device process and design, a high transmission THz-wave quarter wave plate based on film metamaterial with double layer metallic patterns was also investigated and obtained. We analyze the effects introduced by the near-field coupling between the double-layer metallic patterns and the resonance modes. The near-field coupling plays an important role in the THz-wave device performance, and it also plays a key factor in the THz-wave near-field imaging.
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| Current Status of Research Progress |
Current Status of Research Progress
3: Progress in research has been slightly delayed.
Reason
Metamaterial with double-layer split ring resonators (SRRs) was proposed for the terahertz (THz)-wave near-field imaging system. One of the key factors for this work is the film metamaterial device. In last financial year, metamaterial design and device development were preliminary conducted. However, for optimization, metamaterial design requires a large electric field enhancement, which usually accompanies with high-Q resonance. Film Metamaterial device requires a thin substrate to maintain the near-field coupling, meanwhile it also requires a certain thickness to support the metallic patterns. In this financial year, optimization work was carried out on the film metamaterial device for the next step research.
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| Strategy for Future Research Activity |
The research topic is using metamaterial with double-layer split ring resonators to build a THz-wave near-field imaging system. We developed the film metamaterial device, investigated the near-field coupling mechanism of the double-layer metallic patterns, optimize the metamaterial design, and published a work based on this analysis. Those are important steps towards the final target of the near-field imaging system. The next work will mainly focus on the THz-wave optics for near-field imaging setup, and meanwhile I will also investigate the potential ability of film metamaterial for functional THz-wave devices.
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| Causes of Carryover |
Last fiscal year, research work mainly focus on the film metamateiral device optimization, both for design and process, for which the budget mainly spent on the numerical simulation and clean room usage. Next fiscal year, device measurement and imaging system will be conducted. For the imaging system setup, nonlinear crystal and optical components are needed. Budget will be spent on several items. 1. material purchase. 2. Journal paper publication. 3. International conference registration and trip.
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